| 摘要 |
A metallic gasket according to the present invention is constructed such that increased thickness portions (Ti) surrounding combustion chamber holes (6), respectively, are formed on a base plate (1), a bead (1a) formed on the base plate strides over a stepped portion formed by the increased thickness portion, and a load of the bead is gradually increased from a bolted portion toward a combustion chamber hole, so that sealing performance of the bead can be effectively displayed in accordance with a gap between mating surfaces produced at the time of bolting a cylinder head in a multi-cylinder engine. Further, the raised shapes of the bead around the combustion chamber hole in the vicinity of the bolted portion are formed asymmetrical with each other on the side of the increased thickness portion and on the side of a non-increased thickness portion (Td), namely, the shape of the bead on the side of the non-increased thickness portion is formed into a small curve to increase a spring constant, and the shape of the bead on the side of the increased thickness portion is formed into a large curve or a straight slope to make a spring constant thereof smaller than that on the side of the non-increased thickness portion, whereby the load of the bead on the side of the increased thickness portion at the time of the bolting is decreased, so that the degree of localized adherence of the increased thickness portion around the combustion chamber hole in the vicinity of the bolted portion can be improved. |
